| Subject: | Service VME - Aftermarket Wheels/Tire Pressure Monitor/FMVSS 138 |
| Models: | 2004-2006 Cadillac Escalade Models |
| 2004-2006 Chevrolet Suburban, Tahoe |
| 2004-2006 GMC Yukon Models |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
SERVICE VME
Starting with the 2004 Model Year, all vehicles with RPO UJ6 are now equipped with a Tire Pressure Monitoring System (TPM).
The system consists of:
| • | Four Sensors, one for each wheel
|
| • | Passenger Door Module (PDM)
|
| • | Instrument Panel Cluster or Driver Information Center Message
|
Each sensor sends a unique RF signal to the PDM to indicate the tire pressure. The PDM receives the signals and coverts them to pressure data. This data is sent to the Driver Information Center on the Class 2 network. If any tire is more that 25% below
the vehicles recommended tire pressure, the driver will receive notification to "Check Low Tire" either on the Instrument Panel Cluster or the Driver Information Center. This message will stay active until the low tire concern is corrected. This message
cannot be disabled due to FMVSS 138. Aftermarket wheels installed without the sensors will activate the "Service Tire Monitor" warning and will stay on until the sensors are installed. Even if the sensors are installed in aftermarket wheels they may not mount
in the correct OEM orientation and still turn on the "Service Tire Monitor" message.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
